main.dart: changes in latest flutter

src/sprightly/lib/main.dart

@@ -19,6 +19,10 @@ class MyApp extends StatelessWidget {
         // Notice that the counter didn't reset back to zero; the application
         // is not restarted.
         primarySwatch: Colors.blue,
+        // This makes the visual density adapt to the platform that you run
+        // the app on. For desktop platforms, the controls will be smaller and
+        // closer together (more dense) than on mobile platforms.
+        visualDensity: VisualDensity.adaptivePlatformDensity,
       ),
       home: MyHomePage(title: 'Flutter Demo Home Page'),
     );
@@ -96,7 +100,7 @@ class _MyHomePageState extends State<MyHomePage> {
             ),
             Text(
               '$_counter',
-              style: Theme.of(context).textTheme.display1,
+              style: Theme.of(context).textTheme.headline4,
             ),
           ],
         ),